Material No.: K 90941

DescriptionChemical
composition		Physical
mechanical
properties		Temparature
information		StandardsProcess
information		Application
Certification		ProductsAll

Description

EN symbol (short)X11CrMo9-1
Material No.1.7386
AFNOR11 CrMo9-1 / NF EN 10216-2 (08/2007) (FR)
BSX11 CrMo9-1 / B.S. EN 10216-2 (08/2007) (GB)
Density kg/dm37,77
Hardness (HB)
CompositionAlloyed stainless steel
CategoryHigh-temperature steel
Structuremartensitic

Chemical Composition

 CMnPSiCrMoSCuAlFe
K 90941Min % 0,30 0,508,000,90    
Max %0,150,600,0301,0010,001,100,030   
1.7386Min %0,080,30 0,258,000,90    
Max %0,150,600,0251.0010,001,100,200,300,040 
(Key to Steel 2010)

Physical properties

PropertyValue
Density: kg/dm37,77
Hardness: (HB)---
Temperature T
°C/F
(°C/F)		Specific heat
J / kgK
(Btu / lb °F)		Thermal conductivity
W/mK
(Btu·in / ft2·h·°F)		Electric resistance
µΩ · cm
(Ω circ mill / ft)		Modulus of elasticity
kN/mm2
(103 ksi)		Expansion rate from 70°F bis T
10-6 / K
(10-6 / °F)
20/ 21/() 217 
100/ 23/()   
200/ 24/()   
300/ 26/()   
400/ 27/()   
500/ 28/()   
600/ 29/()   
Temp.Creep strain limitCreep strain limitCreep rupture strengthCreep rupture strengthCreep rupture strength
°C/°F100 000 h200 000H
°C/°FMpa / ksiMpa /ksi
400 / 752     
450 / 842  276 / 40,0259 / 37,5 
480 / 896  211 / 30,6196 / 28,4 
500 / 932  174 / 25,2160 /23,2 
550 / 1022  92 / 13,380 / 11,6 
ksi value calculated

Mechanical properties (20°C / 68°F)

Dehngrenze220-390 /31,9-56,5
Dehngrenze 
Zugfestigkeit590-750 /85,5-108,7
Bruchdehnung20 % /18 %
Schlagarbeit ISO-V> 40Jlengthwise
(Mittelwert von 3 Proben) 

Temparature information

Application area
Operation temperature14 ºF  to 1022 ºF 
hardness
Working temperature1634 ºF  to 1742 ºF 
Explanation reportcooldown: air/oil
Solution heat treatment
Working temperature1472 ºF  to 2012 ºF 
annealing
Working temperature1328 ºF  to 1472 ºF 
Explanation reportcooldown: air
Normalizing
Working temperature1634 ºF  to 1742 ºF 
Heat treating
Working temperature1562 ºF  to 2012 ºF 

Standards / information

StandardsDesciption
ASTM A 213 Standard Specification for Seamless Ferritic and Austenitic Alloy-Steel Boiler,Superheater,and Heat-Exchanger Tubes
ASTM B 335Standard Specification for Nickel-Molybdenium Alloy rods

Process information

Welding
 - Typemanual arc welding
 - Add. materialsame type material

Main fields of application

Details of application
Certifications
Power engineeringÜberhitzerrohre
Sammler

Range of products

Product typeProduct
Plates / Sheetsplates/sheets
plate/sheet cuts
Fittingswelded elbows
welded reductions
Welded T-pieces
seamless elbows
seamless reductions
seamless T-pieces
Other Fittings a.o. Weldolets, Nipples
Pipes / Tubeswelded pipes/tubes
seamless pipes/tubes

Liability exclusion

All aforementioned specifications serve as a general orientation and have to be reviewed depending on the conditions of use.
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